Rethreading-tool.



D. G. GARBARINO & G. W. ROESSLE.

RETHREADING TOOL.

APPLICATION FILED DBO. Z8, 1910.

Patented Feb. 13, 1912.

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e e c Illas v INI/ENTUR :Don/ud G. Garber-mo ChorleSV/Poess le ATTORNEYS UNITED STATES PATENT OFFICE.

DAVID GEORGE GARBARINO ANI)l CHARLES WILLIAM IROESSLE, F NEW YORK, N. 'Y'.

RETHREADING-TOOL.

*Y Specication of Letters Patent.

Patented Feb. 13, 1912',

j Application led December 28, 1910. Serial No. l599,664.

To all whom t may concern Be it known that we, DAVID G. GARBARINO and CHARLES W. ROESSLE, citizens of the United States, and residents of the city of screws or bolts, and it comprises means for engaging thescrew or bolt to be re-threaded,

.in combination with means having a cutting edge which fits the groove between the threads.

It is designed mainly' for use in re-forming V-shaped threads, and it is so con-- structed thatthe tool can be adjusted to the size of the bolt which is to be repaired. Our invention can also be used to repair metricthreads, -or any other thread of triangular shape.

Reference 1s to be had to the accompanying drawings forming a partof this specication, in which similar charactersof reference indicate the views. v

Figure 1 is a front elevation of our rethreading tool; Fig. 2 is a longitudinal sectional view taken on the line 2-2 of Fig. 1; Fig. 3 is a face view of a modification shown on a smaller scale; and Fig. 4 is a transverse sectional view taken on .the line 4--4 of Fig. 3.

The numeral 1 indicates an open frame of suitable shape, whichmay be rectangular, as shown. This frame has a fixed handle 2 extending from one end, and a boss 3 extending from th'e opposite end, said bo'ss having a screw-threaded bore to receive another handle 4, the inner end of which is screw-threaded, as shown, and the outer end of which is provided with a milled surface 5, which permits the handle to be screwed Ain or out of the bore 3.v The bore of the boss 3 receives a shank 7, which has a smooth surface and is attached to the handle 4 by means of a stud 6 extending from the inner end of the handle 4 and entering a recess in the end of the shank 7 This stud holds the shank 7 in axial alinement with the handle 4 and coperates with means for preventing the shank 7 from turning or twisting around its longitudinal ax1s. These means comprise a longitudinal key-way 8 in corresponding parts in all the shank 7 which is engaged by a pin 9 The groove 8 is of such a size .as to ycause the pin 9 to fit carried by the frame 1.

loosely therein in order tvoallow a certain amount of play to the shank 7 in the boss 3, so that when the disksh'aped member 10, carried by the shank,'engages the thread of the bolt or screw to be repaired, the shank 7 and the disk 10 will be allowed to turn to the 4necessary angle to produce the proper t ofthe disk 10 into the grooves between the threads on `the bolt. This disk 10, as show n particularly in Fig. 2, is mounted on a spindle 11, and-is rotatably supported in a yoke onthe inner end of the spindle 7, and its snugly between the arms of the said yoke. The framel also carries on the inside thereof across-member 12, which is -adjustably mounted in the frame 1 on. a U- shaped pin 13, passing through longitudinal perforations 14 in the member 12.. The sides of the frame member 1 contain a number ofperforations 15, whichare separated from one another by distances equal to the distance between the members of the U' shaped pin' 13, so that the transversemember 12 can be adjusted in the frame 1- toward and from the boss 3, and .held in any desired position by the pin 13 being passed through the holes 14 and 15 in the transverse member 12 and the frame member 1,-respectively. The pin, of course, has a snug fit in the holes 14 and 15. l

The transverse member 12 carries two spindles 16 mounted in the side thereof facing the member 10. These spindles 1 6 each carry a suitable number of disk-shaped members 17, which are received by recesses in the transverse member 12, as shown on Fig. 2. As shown, the disk-shaped member 10 and the disk-shaped members 17 are provided with V-shaped edges so that they will t. in the grooves between the V-shaped Athreads which are to be renewed, and the disks 17 are so mounted on their spindles 16 that a small amount of end play isallowed to these disks, thus allowing the disks to fit a bolt of any size havin a thread of almost any pitch. The disks 1 also wabble slightly to iit the slope of the threads.

l The modification shown on Figs. 3 and 4 is similar to that shown on Figs. 1 and 2, except that the transverse member 12 and the means for adjusting the same are dispensed with. In this modification there are two'spindles 18, which are mounted in the end of the frame 1, from which projects the fixed handle 2. The spindles are supported by a transverse projection 20 in the end of the frame 1, and the spindles carry on each end thereof disk-shaped members 19, shown as provided with sharp V-shaped edges, as in the' case of the disk-shaped members 17. The disks 19 also have end play and Wabbling movement like the disks 17.

When using the form shown on Figs. 1 and 2, the bolt is ut in place so as to be engaged by the dis 10 andthe disk-shaped members 17, being held substantially perpendicular to the plane of the frame 1. The transverse member is adjusted toward or from the member 10 to make the re-threading tool lit substantially the size of the'bolt which is to be threaded. The final adjustment is then effected by screwing 1n the handle 4, which forces the disk 10 1n place.l

With the form shown on Figs. 3 and: 4,

all of the adjustment is effected by means4 of the adjustable handle 4. The. bolt or screw to be threaded is simply put 1n place,

with the members 19 engaging its surface,- and the handle 4 is then turned until thel shank 7l is `pushed up far enough to engage the surface of the bolt on the side opposite the members 19, all of the disk-sha ed members, when the bolt is in place an the final adjustment effected, engaging the V-shapedl grooves between the threads thereof and sethe other disks t into the grooves of thel threads on the other side of the bolt, and

ing them to their original size and thus reforming threads which have been crushed or bent out of shape.

All of the disks shown on either of the two modifications described may be provided with sharp V-shaped. edges and may serve not only to secure the bolt in place, but each may also serve as a cutter to force open and re-shape the threads of the bolt or screw which is being worked; or, if desired, only part of these disks may be used as cutters, the remaining disks serving merely as braces tohold the bolt in place. All of the disks either may be made movable so as to rotate around their supporting spindles, or all may be stationary, or part of them maybe stationary and the remaining disks may be movable, so long as they can be adjusted to the slope and pitch of the threads.

Itis only necessary in the successful o eration of our-rehreading tool that one or the disks shown and described be provided with 'a sharp edge to serve as a cutter for re-v pushes the shank 7 and;

threading, and the remaining disksdo not need to serve any other purpose than that of bracing the bolt against the action of the cutting member. The cutting member in such a case may be stationary or may be made rotatable, and in either case it should have a certain amount of play so that it can adjust itself to the slope of the thread to be re-formed, after the manner of the disk 10.

It will be seen from the above that we have devised a practical instrument which is of great utility and which can be employed on any size of bolt having V-shaped threads, to re-form or renew such threads, thus making it possible to effect repairs on an automobile or in a machine shop, or wherever else they are needed, in the shortest ossible space of time, and effecting a consi erable saving in material, for by means of our re-threading tool old bolts and screws which might otherwise have to be thrown away can be readily repaired for further use.

While our invention is designed t0 rethread bolts and screws, it is obvious we may. also use it to cut pipes, tubes and the engage a bolt or screw to be re-threaded at when the bolt is turned, or' the frame is. turned instead, the sharp V-shaped edges ofl all the disks cut through the grooves, widena plurality of points to secure the bolt or screw in position, all of said disk-shaped members being rotatable and one being provided with a cutting edge vto re-form the threads of the screw or bolt, and being loosely mounted; the others having end play and wabbling movement.

2. A re-threadingv tool comprising an open frame, a transversely-mounted adjustable member in said frame, a boss carried by the outside of said frame and having a bore therethrou h extending in the direction of the longitudinal axis of the frame, a shank carrying a disk-shaped member on its inner end, mounted in said bore, and disk-shaped members carried bythe transverse member in the side adjacent to the disk-shaped member in the end of the shank, said disk-shaped members forming means for securing a bolt or screw in the frame to be re-threaded, one or more of said disk-shaped members being provided with a cutting edge to engage and re-form the threads of said bolt or screw.

3. A re-threading tool comprising an able member in said frame, a boss carried by the outside of said frame and having a-bore therethrough extending in the direction of the longitudinal axis of the frame, a shank carrying a disk-shaped memberin its inner end, adjust-ably mounted in said bore, and disk-shaped members carried by the transverse member in the side adjacent to the disk-shaped member in the end of the shank, said disk-shaped members forming means for securing a bolt or screw in the frame to be re-threaded, one or more of said diskshaped members being provided with a cutting edge to engage and re-form the threads of said bolt or screw.

4. A re-threading tool comprising a frame, a handle extending from one end of said frame, a transverse member adjustably mounted in said frame, a boss extending from the side of the frame opposite the said handle member, another handle member adjustably mounted in said boss, a shank mounted in said boss, terminating within the frame, said shank being connected to the handle member and having a longitudinal key-way in its surface, a pin in the frame, loosely fitting said key-way, a diskshaped member in the inner end of said shank, and disk-shaped members carried by the transverse member on the side facing the shank, the said disk-shaped members forming means for securing a bolt or screw in position in the frame, the shank disk of said disk-shaped members forming a cutter to fit the threads of the bolt or screw and re-form them, the other disks having end play and wabblingmovement.

5. A re-threading tool comprising an open frame, and a plurality of members mounted in said frame and adapted to engage a bolt or screw to be re-threaded at a plurality of points to secure the bolt or screw in position, one of said members being provided with a cutting edge to re-form thethreads of the screw or bolt, and being loosely mounted to fit the slope of the thread of the screw or bolt, the other members engaging the outer periphery of the screw or bolt to hold the same in position to allow the cutter member tomove between the said threads.

6. A re-threading tool comprising an open frame, and a plurality of members mounted in said frame and adapted to engage a bolt or screw to be Are-threaded at a plurality of points to secure the bolt or screw in osition, one of said members being provi ed with 'a cutting edge to re-form the threads of the screw or bolt, and the other members having end play and wabbling movement to` adjust themselves to the pitch ofthe threads and the slope of the same and hold the bolt or screw in position to allowl the cutter member to engage the bolt between the threads.

7. A re-threading ,tool comprising an open frame, and a plurality of members mounted in said frame and adapted to engage a bolt or screw to be re-threaded at a plurality of' points to secure the bolt or screw in ositlon, one of saidlmembers being provi ed with a cutting edge to re-form the threadsof the screw or bolt, and being loosely mounted to adjust itself to the slope of the threads, the other members being mounted to have end play and wabbling movement to adjust themselves to the slope of the threads and the pitch of the same.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses. 'f

DAVID GEORGE GARBARINO. CHARLES WILLIAM ROESSLE. Witnesses:

CHAS. F. DOLL, FRANK S. DE LEo. 

